Wilwood GT Slotted Front Brake Conversion, Mazda MX-5 Miata (2006–2015), Red Calipers and 12.88-Inch Rotors

GT slotted 12.88-inch front rotors and red six-piston Superlite calipers make up this Wilwood conversion for the supported Mazda MX-5 Miata applications. The kit uses separate hats and the correct radial brackets for the compatible factory hub and spindle. The manufacturer installation list also specifies included front flex lines, so the selected package covers both the friction hardware and its flexible hydraulic connections. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. The company designs and manufactures disc brake systems and components, including calipers, brake rotors, master cylinders, valves, fittings, and brake lines for motorsport, street-performance, and specialized applications.

Technical Details

• Manufacturer part number: 140-12907-R
• Type: Forged Narrow Superlite 6R Big Brake Front Brake Kit (Hat).
• Calipers: Forged Narrow Superlite 6R; 6-piston; Red Powder Coat.
• Piston bore dimensions: 1.38, 1.12, 1.12 inches; stainless pistons. Caliper mounting: radial.
• Included pad compound: BP-10.
• Rotors: 12.88-inch outside diameter × 1.10-inch width; GT Slotted; Spec-37 Iron; Black Electro Coat surface finish.
• Rotor ventilation: 48 curved vanes.
• Rotor hats: Big Brake Hat - Flared Bell; Aluminum; Black E-Coat.
• Wheel bolt circles: 5 x 4.53 inches.
• Included: paired calipers, pads, rotors and mounting hardware, caliper mounting brackets, rotor hats.
• Application-specific hydraulic flex lines included.
• Conditional wheel minimum: 17 inches. Compare the complete wheel-clearance diagram with both barrel and spoke dimensions.
• Supplied wheel spacers are required for stock-wheel clearance. Use the DS956 clearance drawing with its specified spacer installed; account for the resulting wheel position.

Fitment & Compatibility

Match the vehicle year and trim in the table and inspect the original hub registration before assembly. Any replacement upright or modified hub needs comparison with the installation drawing. Establish rotor position and caliper alignment before fitting the wheel. Use the full template to assess barrel diameter and spoke offset, not merely the wheel's advertised size. Check hose clearance throughout steering and suspension movement and confirm the front/rear braking relationship for the completed car.

Match the individual year, model, submodel and equipment conditions in the fitment table below.

Wilwood installation documents: Installation instructions.

PMB Performance has over 20 years of brake-system experience. Contact us with the vehicle and installed hardware details for help confirming the complete setup.

Manufacturer warning, brake pads only: WARNING: This product can expose you to chemicals including Arsenic, Cadmium, Chromium (Hexavalent compounds), Lead, Nickel, Cobalt and Antimony Trioxide which are known to the State of California to cause cancer or other reproductive harm. For more information go to www.p65warnings.ca.gov.